I think it's a confusing pattern. I read it that the last 8 rows are purled, and you're decreasing 10 sts every other row, so you'll be decreasing a total of 40 sts. I'd go to knittinghelp.com and look at purl decreases (I see SSP on the page.) I very rarely decrease in a purl row, so I can't help you with what might be going wrong. But decreases typically don't form holes.